All categories

1 year ago

Is the cell an open or closed system? Explain your answer using at least one example of a cell organelle and its function.

Biology

1 answer:

Maksim231197 [3]1 year ago

4 0

Answer:

In an open system matter and energy can be transferred ·

In a closed system only energy can be exchanged ·

In an isolated system neither matter nor energy can be exchanged · The cell has to be an open system because it needs to exchange matter and energy and the only way to do so is through an open system ·

As an open system the cell allows nutrients to enter the cell and waste products to exit the cell ·

The cell does this through the use of a semi-permeable membrane

Explanation:

You might be interested in

During periods of rapid environmental change, what may happen to a species that was well-suited to the former environment?

Hunter-Best [27]

Answer:

The environment usually refers to all the biotic and the abiotic components that are surrounding us. This environment undergoes changes depending upon various factors which can be natural and/or due to the anthropogenic activities.

When there occur rapid environmental changes, then it directly affects the lives of species, in different ways, such as-

Those species that are comparatively weaker in adapting according to the environmental changes that occur, will not be able to cope up with the new environment. They may become extinct.

Some variety of species will be able to adapt to the new environment because of their easily adapting capabilities.

The traits that will be developed within the species in the new environment will be more successful in terms of reproduction.

The previously existed traits may have a harmful impact in the newly formed environment.

5 0

3 years ago

A fold is a ------------ in rock, and a fault is a -------------- in rock.

wolverine [178]

Answer:

bend the answer

5 0

3 years ago

Read 2 more answers

What is the definition to 'light'?

Olenka [21]

Answer:

Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to visible light, which is the visible spectrum that is visible to the human eye and is responsible for the sense of sight.

3 0

3 years ago

In order for P. multocida to survive and carry out cellular functions (and cause infection), the energy contained in each molecu

gladu [14]

Answer:

Components of the electron transport chain (ordered by electronegativity from least electronegative to most electronegative):

NADH dehydrogenase >> Coenzyme Q >> Cytochrome b-c1 complex >> Cytochrome c >> Cytochrome oxidase complex > O2

Explanation:

The electron transport chain transfers electrons from donors to acceptors via redox reactions (i.e., where reduction and oxidation occur together), and couples the transfer of electrons with proton transfer (H+ ions) across the membrane. In the electron transport chain, the electrons are transferred from NADH dehydrogenase NADH to oxygen (O2) through a series of transmembrane complexes: NADH-Q oxidoreductase, Q-cytochrome c oxidoreductase and cytochrome c oxidase. In the first place, the reduced form of coenzyme Q (ubiquinone) transports the electrons from the NADH-Q oxidoreductase to the Q-cytochrome c oxidoreductase complex (Cytochrome b-c1 complex). Second, the cytochrome c transports the electrons from this complex (i.e., Cytochrome b-c1 complex) to the Cytochrome oxidase complex, this being the last component in the electron transport chain that is responsible to catalyze the reduction of O2.

6 0

3 years ago

In humans, Rh-positive individuals have the Rh antigen on their red blood cells, while Rh-negative individuals do not. If the Rh

bixtya [17]

Answer: 60%

Explanation:

In population genetics, the Hardy-Weinberg Principle states that the genetic composition of a population remains in equilibrium as long as no natural selection or other factors are active and no mutations occur.

The frequencies of the genotypes of an individual locus will be set to a particular equilibrium value. It also specifies that these equilibrium frequencies can be represented as a simple function of the allelic frequencies at that locus. In the simplest case, with a locus with two alleles A and a, with allele frequencies of p and q respectively, the principle predicts that the genotypic frequency for the dominant homozygous AA is p^2, that of the heterozygous Aa is 2pq and that of the recessive homozygous aa, is q^2. The allele frequency of a is represented as p and the frequency of recessive allele is q.

The three genotypes AA : Aa : aa appear in a ratio p² : 2pq : q². If we add them up, we get the unit:

p^2 + 2pq + q^2 = (p + q)^2 = 1

And p + q = 1

Rh-positive genotypes are represented as AA (homozygous dominant) or Aa (heterozygous) since the presence of a single dominant allele is sufficient to express the phenotype. While Rh-negative genotypes are represented as aa.

If 84% of the population is Rh-positive, that means that this percentage includes all those who are AA and Aa. Then 16% are aa.

F(aa)=q^2=0.16

then F(a)=q=0.4

And since p + q = 1, p + 0.4 = 1, then p is 0.6

We can also calculate the rest, then F(AA)=p^2= 0.36

So F(Aa)= 2pq = 2 x 0.6 x 0.4 = 0.48

Notice that 0.36 + 0.16 + 0.48 = 1

3 0

3 years ago